Which of the following examples demonstrates a positive feedback mechanism? A signal in one part of the body causes an accelerated effect in another part

Levels of waste products in the blood are lowered when they get too high.

The temperature of the blood is maintained at a set point of 98.6ºF.

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Answerfarmer's market; (b) would be my second choice

(a) is not correct because one does not get increased cholesterol  from lifting weights.(b) is not correct because lifting weights cannot reduce the risk of a hereditary disease.(c) is not correct because back pain isn't a benefit! and plus, if he lifts weights properly, he should not have back pain.(d) is the correct answer because his ligaments will gain mass, making it easier for him to carry heavier weights and he will also be stronger!

What are the options or things that were supposed to match

The answer is the uterus. the uterus is where the baby develops, and is also known as the womb. hope this !